19 Name the five 5 different types of measurements that are

19 Name the five (5) different types of measurements that are used in the quantity takeoff of cost estimates and give an example of one typical unit for each one 5 pt. 2. e.g e.q 3. e.q

Solution

1. Unit method- This is done at early stages of the project when designs and plans are not available.

No of persons X cost per unit = Total cost of building

Example: No of desks in a class room X cost per desk = Total cost for desks

2. Superficial Floor area method- This is done once the design plans are made available.

Internal gross area of floor X cost per m² = Total cost of building

Example: Gross area of room is 20 m² and cost per m² is 20$, Then total cost = 20 X 20= 400$

3. Elemental Estimate- This requires cost of each unit in the building

Total cost = total cost of all units

Example: Doors= 10$, floor=20$, Ceiling= 20$. Then total cost = 10+20+20= 50$

4. Approximate Quantities- This requires advanced drawings of the building which requires much detailed information about each unit. Total cost= Total cost for all work groups

Example: Shuttering= 50$, Plastering= 50$, bricks= 30$. Then total cost for wall construction= 50+50+30=130$

5. Cubic Method- This estimating is based on cubic content of building which is single rate method. This method is obselete. Total cost= Volume X (unit cost/m³ ) , volume = external plan area X height

Example: External plan area = 30 m² height= 4 meters, Cost per m³= 50$

Total Cost = 30 X 4 X 50= 6000$